I checked on my tank one morning only to discover my dwarf gourami was dead and amongst the plants. He was totally static, couldn't even see his gills moving. Went and broke the sad news to my wife, she consoled me, went to net him out and all of a sudden he started moving! I freaked out, i'm sure he was just sleeping cuz he's usually VERY aware of any movement outside of the tank and comes to see what's up.